Malicious PDF — malware analysis report

Static analysis result for SHA-256 20a7a37b7b39f4dd…

MALICIOUS

PDF

106.8 KB Created: 2020-12-27 14:30:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ef7a663469bb58e03d1484b6afc370f7 SHA-1: b42ea4f0fbd441a7d1ad2f41ed5a1d78f95a1b09 SHA-256: 20a7a37b7b39f4dd34f6bbbfbe6c8ae8d78e1acc02284c00aed122e77fd344ac
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that directs users to a suspicious domain, likely for a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'Doomsday preppers' and the wkhtmltopdf application, suggesting a lure to entice users to click the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://trafffe.ru/strik?utm_term=doomsday+preppers+full+episodes PDF link annotation
    • https://cdn.sqhk.co/nerutamar/hjiiEhd/dude_perfect_2_game_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fefoseto/TC0igie/fury_of_a_deadman.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ac1523b-07cd-48d3-892b-4d90cc76d986/9222597348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f18a7427-4a69-4d64-8788-8d41189f2d2b/togiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e0d413b-92f0-453d-8a03-5468d5766e8b/zalmos_youtube_proxy_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4d4a4c6-175d-48c7-b9af-29711c436f74/gemirisopowur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86af01c6-cf8d-41cd-8483-262818052b91/union_endicott_high_school_phone_number.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18f42d5c-3060-4184-b229-520f801c2ca6/word_whizzle_insurance_answers_hot_stuff.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45189f1b-cac4-4ea6-ac1a-d9dcb52b600a/32247852492.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3f73217-afca-4faf-a823-494f84f74db6/55622510393.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab733314-a98c-4fb7-90e6-b3cc67379972/12511975498.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78512912-46e0-4b09-8452-261039fad2a4/how_to_learn_faster_anything.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b8985da0-7724-4161-9d6c-8c240de887cf/5888281946.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6a623f9-9559-404e-94b4-fbca115ccbba/gekubebometo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01ad2350-2c59-4e5a-9179-015429ef905c/49456820647.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000133a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133A2 16656 bytes
SHA-256: 9fbc643fc74af9807096e8387a78b43f093c1624ab0311f3326d7f8914733982
font_01_sfnt_off00016597.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16597 5288 bytes
SHA-256: 841ddc17a893e82ae2985b940d45b0465a29011c037f0e406e1814ae1d0c1a65
font_02_sfnt_off0001778a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1778A 11332 bytes
SHA-256: a3f4c24cd39b4ba952f4dd2892b1d0fd1345f5ea2cd5a9e9a9bf28ff9a469067

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